Discussion
Assertion (A): The Richter scale is unsuitable for comparing very large earthquakes.
Reason (R): The Richter scale has a fixed upper limit of 10.
Select the correct option.
Answer: D
The assertion is correct, but the reason is not: the scale has no arbitrary ceiling of 10. It becomes unsuitable because it saturates, the amplitude it measures ceasing to grow once the rupture is much longer than the wavelength observed.
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